Miles "Tails" Prower is a main playable character in Sonic Adventure and a characters in Sonic Colors.
Sonic Colors
In Sonic Colors, Tails appears in cutscenes, mainly talking with Sonic and Yacker.
Sonic Adventure
Tails is a main character and a playable character in Sonic Adventure. His first appearance was in Episode 1: Ridiculous Relay, as an NPC. Later, in Episode 16: Tailing Off, he became the second character to have their story played.
Trivia
- Tails was somehow able to get into LittleBigPlanet, disguising himself as The Unknown Adventurer.